Gas-tight seal for relatively-moving parts of ovens



Jul 31, 1928. 1,679,0 18

F. BARTLING- GAS new 5m FOR mamnvrm nouns mm; or ovsns 5 Filed May 16,1927 I 1 2 2-2. q l k 'm n n I 0 I b Patented July 31, 1928.

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s PATENT FRIEDRICH BARTLING, or MUNICH, GERMAN GAS-TIGHT-SEAL 1 Rniinemrvnnr lvrovms LPARTS or OVENS.

Application filed. may 16, 1927, Serial No. 191.913, and in GermanyJanuary 15, 1927.

For the purpose of effecting a gastight closure or seal betweenrelatively movable parts of ovens and the like for instance, betweenfixed and moving parts thereof, nu-

r merous varieties of so-called sand channels have, as is well; known,been employed. These sand channels consist generally of a gutter ofitsection, located on one of the oven members and substantiallyfilledwith H- sand, into which dips a web plate or r b secured to the otheroven member. In this manner gas tight closure is effected between theinterior of the oven and the external atmosphere, or between twodifferent compartl5 ments of the oven, without impairing the relativemobility of the several oven parts involved. I

Such a. device particularly adapted for application to the so-called'revolving anac nular sole type of ovens, 111 winch, as is well. known,an annular oven chamber open at the bottom, has that opening closed by aretatingi plate which functions as the working sole plate. Obviously agastight and heat proof closure must exist between the wall of the ovenand the rotating plate, in order that the oven gases may not escape.Generally a-sand channel will be employed'for this purpose.

3i: So long as the dipping web proceeds reg ularly and without deviationbetween the walls of the sand channel no obstruction or otherdisturbance can take place within said channel. It is, however,impossible to secure such regular movementof the web; in practiceoscillatory movements are set up and the web thus moves laterally withinthe channel, that is to say, in a direction perpendicular to the axis ofrotation where a rotary 49 web member in action.v Such irregularmovement, which it is practially impossible to avoid in the moving partsof large and heavy ovens, gives rise to ances which occasionconsiderable trouble in working. Thu. displaced, it pr the sand to oneside of the channel, so that the depth of thebcd of sand on one side ofthe web is diminished while on the other side the sand piles up 50against the wall of the channel. The resultof this generally is to causethe sand to overflow from the channel onto adjacent parts where itspresence is undesirable. At

the same time, the amount of sand in the 5 channel is, of course,diminished, so that the secondary disturbi when the dipping web is soeflicacy of theseal is'reduced also and has to be restored byreplenishing the sand bed. It is the object of the present invention toovercome these objections. According to the invention, a gas-tight sealfor relatively movable oven members, with a sand channel and a webdipping therein is characterized by the fact that the lower part of thecross-section of the sand channel is bellied out to a pear-shape. Thisformation may be completed by so making the channel section that abovethe bellied portion there is a narrowed or necked region. At the sametime, the dipping web is pierced from side to side with suitableapertures, for instance a row of holes may be provided in it. 7 p i Theshaping of the cross-section of the sand channel in the manner abovedescribe-d results in the first place, in preventing the sand fromoverflowing from the channel when the dipping web moves laterally. Atthe same time the sand which tends to pile up at one side of the web isforced to pass through the apertures aforesaid to the opposite side ofsaid web. Thus there results a continuous equalization of the quantitiesof sand on each side of the web, while overflow and irregulardistribution of the sand in the channel are completely avoided. Anexample of a const'uction according to the present invention isillustrated in the accompanyingdrawing, wherein:

Fig. 1 shows a sand channel with dipping web constructed according totheinvention while, 1 i

Fig. 2 shows an example of the application of said invention to an evenof the annular rotating sole type As shown in Fig. 1, the oven sealingmeans consists of a channel a and a web 6, the channel being associatedwith one of two relatively movable oven parts and the web with the otherof these parts. The channel a is filledwith sand so as to provide atight closure on both sides of the web 6. Normally, when the two ovenparts move relatively to one another, the web 52 will be displaced in adirection parallel to the channel walls (see arrow 0) but when irregularmovements or oscillations take place lateral digression of the web, inthe sense indicated by arrow d are set up. If the web Z) be displaced,for instance in the right handed direction ofthe arrow d, it forces thesand to Fig. 2, the improved no displacement of the The web I) isprovided, adjacent its lower with a series of perforations it; As

edge,

reason of lateral movesoon as-the sand, by ment of the web 7), wall ofthe channel, it gets squeezed through the perforations h to the otherside of the web, thus securing a quicker equalization of the quantitiesof sand on opposite sides of said web.

In the constructional example according to sand channel arrange ment isshown in its application to an oven of the annular rotating sole type,though it is to be understood that the details of this oven form no partof the present invention. The stationary, annular oven chamber 70 has anopen bottom which is closed by the rotating sole plate Z which issupported at its edges by carrier rings m running on rollers n. Therotating sole Z is heated from beneath by a heatingfine 0. Between thesole Z and the heating flue 0, onthe one hand, and betwen said soleplate and the oven chamber is, on the other hand, sand channel seals arearranged. These consist severally of the sand channels a, a withcorresponding webs I), Z).. The sand channel a is arranged on thestationary heating fine 0 and the web 6 on the rotating sole E. To thislatter is also secured the channel a while the web I) is arranged on thefixed oven wall Z2.

It is obvious that, so long as the rotating sole Z runs true in itscircular path, there is beds of sand in the sand channels. Suchabsolutely true rotary motion is, however unattainable and oscillationstake place which result in lateral movements of the webs. The sand inthe channels is then squeezed between the webs and the channel walls andwould overflow but for the equalizing action due to the particularconstruction and arrangement of channel and web as hereinbeforedescribed.

channel immediis forced up against the Having now particularly describedand ascertained the nature of my said invention and in what manner thesame is to be performed, I declare that what I claim is 2- 1. A gastight closure or seal for interposition between relatively movablemembers of ovens and the like, comprising a sand channel mountedon oneof said members, the walls of said channel converging toward each otherat the top so the channel has a substantially pear-shaped cross-section,sand in said channel, and a web connected to the other member anddipping into the sand, so that during relative movements of said web andchannel at a right angle to the di rection of the relative movement ofthe members, the converging walls of the channel prevent the web fromforcing sand from the channel.

2. A gastight closure or seal as in claim 1, in which the webis providedwith apertures beneath the level of the sand, through which the sand maypass from one side of the web to the other during such movements at aright angle.

3. A gastight closure or seal for interposition betweenrelativelyrotating 'members of ovens and the like, comprising an annularsand channel mounted on one member, tie walls of the channel convergingtoward each other at the top, sand in said channel, and an annular webconnected to the other member and dipping into the sand, the sandpermitting relative radial movements of said channel and web withrespect to their axis of relative rotation during which the convergentwalls of the channel prevent the sand from being pushed therefrom. i

i. ii gastight closure or seal for inter-- position between relativelyrotating members of ovens and the like, comprising an annular sandchannel mounted on one member, sand in the channel, and an annular webconnected to the other member and dipping into the sand, said web havingholes therethrough adjacent its lower end and beneath the sand so thatwhen said web and channel have a relative radial movement with respectto their axis of relative rotation, sand may pass through certain ofsaid holes from one side of the web to the other. 7

In testimony whereof I have signed my name to this specification.

FRIEDRICH BARTLING.

